Journal of Mechanical Science and Technology

, Volume 23, Issue 6, pp 1670–1679

Measurements of the characteristics of spray droplets using in-line digital particle holography

Authors

  • Yan Yang
    • Key Lab. of Automobile Parts & Test Technique of Ministry of EducationChongqing University of Technology
    • Dept. of Mechanical Systems EngineeringChonnam National Univ.
    • Dept. of Mechanical Systems EngineeringChonnam National Univ.
Article

DOI: 10.1007/s12206-009-0417-1

Cite this article as:
Yang, Y. & Kang, B. J Mech Sci Technol (2009) 23: 1670. doi:10.1007/s12206-009-0417-1

Abstract

In-line digital particle holography is applied to measure the characteristics of spray droplets. Common reconstruction methods were considered and the best one was selected. Several important parameters at the time of hologram recording, such as the object distance and the region of laser beam used, are discussed. The feasibility of the correlation coefficient (CC) method for focal plane determination of 3-D droplets was verified. A double exposure hologram recording system with synchronization system for time control was established, and two digital spray holograms were obtained in a short time interval. For post-processing of reconstruction images, the two-threshold and the image segmentation methods were used in binary image transformation. Using the CC method and some image processing techniques applied to droplets in each double exposure image, the spatial positions of droplets used to evaluate the three dimensional droplet velocities were easily located, which proved the feasibility of in-line digital particle holographic technology as a good measurement tool for spray droplets.

Keywords

Digital particleHolographySpray dropletsCorrelation coefficient method

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2009